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If you're installing a new battery, you should calibrate it after installation:

Charge it to 100%, and then keep charging it for at least 2 more hours. Next, unplug and use it normally to drain the battery. When you see the low battery warning, save your work, and keep your laptop on until it goes to sleep due to low battery. Wait at least 5 hours, then charge your laptop uninterrupted to 100%.

If you notice any unusual behavior or problems after installing your new battery, you may need to reset your MacBook's SMC.

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You guys are awesome! My granddaughter spilled a whole coke on the Mac and it went fizz! After some weeks I took it to the Apple store where it was declared it dead. They offered me a refurbished machine for $800, but insteaed I came home, took the disk out and hooked it via a USB carrier to another Mac which proved that the disk had not been harmed. I put it back in the machine and booted up at which point it became obvious that the battery was dead. One pass at Google turned up IFixIt where I found the battery and the correct, goofy tri-point screwdriver. The battery arrived a bit ago and the Mac is up and running as if nothing happened . . . a tidy savings of $650!

This was a total life saver! A few weeks ago my house was hit by lightning and even though my computer wasn't plugged in (thank God!) my charger was completely fried. I ordered a new charger but my computer still wasn't working- Apple said my computer was done for. A friend said it was probably my battery and told me about ifixit.com. I was able to buy a new battery and change it myself (it was so easy!!!). Saved me from spending a bunch of $$ at the Apple store. I move out of the Country in a few weeks and didn't know what I was going to do without a computer. Thanks ifixit!!!